Olympus — Four Thirds standard zoom kit lens, 17.5-45mm f/3.5-5.6, E-500 kit optic
Olympus Zuiko Digital 17.5-45mm f/3.5-5.6 was a standard zoom for the Four Thirds DSLR system, Olympus's digital SLR mount launched in 2003. It served as an alternative kit lens bundled with the Olympus E-500 around 2005, giving a 35-90mm equivalent range on the 2x-crop sensor.
It uses 7 elements in 7 groups, with maximum aperture running from f/3.5 at 17.5mm to f/5.6 at 45mm via a 7-blade rounded diaphragm, closing to f/22. Minimum focus is 0.28m throughout the zoom range. It takes 52mm filters, measures 71x70mm, and weighs about 210g.
As an entry-level kit zoom it favours compactness and close focusing over resolution, with a plastic barrel and mount lighter-duty than the pricier Zuiko Digital 14-54mm. Against the more common 14-45mm kit lens it starts narrower at 17.5mm for the same 45mm long end.
Four Thirds is a discontinued Olympus DSLR system, so this lens sells cheaply used, mainly to owners of older E-series bodies or Micro Four Thirds shooters with an adapter. Check the plastic mount for wear, confirm autofocus engages smoothly, and inspect for haze.